I found this app on stackapps.com - https://stackapps.com/questions/1942/overflow7-stack-exchange-sites-on-windows-phone-7
But when I click on link to download it, Zune launches with app page and there is NO download button (the one with 'FREE' text on it or with price). So I can read how awesome this app is, but I cannot download/install/try/use it.
I suspect submitting of such app NOT worldwide. Is this THE reason?
(I am from Czech republic) Another app I cannot install is Amazon Kindle...